The Plant Pathology Journal 2010;26(3):280-285.
Published online September 30, 2010.
Control Efficacy of Phloretin Isolated from Apple Fruits Against Several Plant Diseases
Sang Hee Shim, Su Jung Jo, Jin Cheol Kim, Gyung Ja Choi
Abstract
In the course of a searching natural antifungal compounds from plant sources, we found that the methanol extract (3,000 μg/ml) of Malus domestica fruits had potential of control against rice blast (Magnaporthe grisea) and tomato late blight (Phytophthora infestans). Under bioassay-guided purification, we isolated phloretin, a phenolic compound, with in vivo antifungal activity against M. grisea. By 1-day protective application of phloretin (500 μg/ml), the compound strongly inhibited the disease development of M. grisea and P. infestans on rice and tomato seedlings, respectively. And red pepper anthracnose caused by Colletotrichum coccodes also was moderately suppressed. However, rice sheath blight (Rhizoctonia solani AG1), and barley powdery mildew (Blumeria graminis f. sp. hordei) were hardly controlled. In addition, the compound showed in vitro antifungal activity against some plant pathogenic fungi including Phytophthora capsici, Alternaria panax, Sclerotinia sclerotiorum, R. solani AG4, and M. grisea. This is the first report on the antifungal activity of phloretin against plant pathogenic fungi.
Key Words: antifungal activity, Magnaporthe grisea, phloretin, Phytophthora infestans, rice blast, tomato late blight


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